Money management expert Larry Swedroe argues that investors who try to time their investment decisions so they are buying when the market is undervalued and selling when the market is overvalued are playing a loser's game. In the 2005 edition of The Only Guide to a Winning Investment Strategy You'll Ever Need, he explains that he is a firm believer in the principles of modern portfolio theory (MPT) and the efficient market hypothesis (EMH). Swedroe writes that he has worked for years to help investors understand how to apply the principles of MPT and EMH to their own unique circumstances and personalities so they have the greatest chance of reaching their financial and life objectives.

When he sought out a book that would help him explain the principles of MPT to investors, he found none that addressed these three fundamental questions:
- How do investors generally believe markets work?
- How do markets really work?
- How can you apply the knowledge of how markets really work to develop a winning game plan tailored to your unique situation?
(Executive Book Summaries)